Claude 3.5 Sonnet v2 vs DeepSeek V3.1
Claude 3.5 Sonnet v2 (2025) and DeepSeek V3.1 (2025) are compact production models from Anthropic and DeepSeek. Claude 3.5 Sonnet v2 ships a 200k-token context window, while DeepSeek V3.1 ships a 64k-token context window. On pricing, DeepSeek V3.1 costs $0.27/1M input tokens versus $6/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
DeepSeek V3.1 is ~2122% cheaper at $0.27/1M; pay for Claude 3.5 Sonnet v2 only for long-context analysis.
Decision scorecard
Local evidence first| Signal | Claude 3.5 Sonnet v2 | DeepSeek V3.1 |
|---|---|---|
| Best for | multimodal apps and provider-routed production | multimodal apps and provider-routed production |
| Decision fit | RAG, Long context, and Vision | Coding, Agents, and Vision |
| Context window | 200k | 64k |
| Cheapest output | $30/1M tokens | $1/1M tokens |
| Provider routes | 2 tracked | 8 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Claude 3.5 Sonnet v2 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Local decision data tags Claude 3.5 Sonnet v2 for RAG, Long context, and Vision.
- DeepSeek V3.1 has the lower cheapest tracked output price at $1/1M tokens.
- DeepSeek V3.1 has broader tracked provider coverage for fallback and procurement flexibility.
- DeepSeek V3.1 uniquely exposes Code execution in local model data.
- Local decision data tags DeepSeek V3.1 for Coding, Agents, and Vision.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Claude 3.5 Sonnet v2
$12,300
Cheapest tracked route/tier: AWS Bedrock
DeepSeek V3.1
$466
Cheapest tracked route/tier: Novita AI
Estimated monthly gap: $11,834. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on AWS Bedrock; start route-level A/B tests there.
- DeepSeek V3.1 is $29/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- DeepSeek V3.1 adds Code execution in local capability data.
- Provider overlap exists on AWS Bedrock; start route-level A/B tests there.
- Claude 3.5 Sonnet v2 is $29/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Code execution before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-12-01 | 2025-08-21 |
| Context window | 200k | 64k |
| Parameters | — | 671B total, 37B active (MoE) |
| Architecture | - | Mixture of Experts |
| License | Proprietary | MITOSI-approved |
| Openness | Proprietary | Open source |
| Commercial use | Commercial use: conditional | Commercial use: permitted |
| Knowledge cutoff | 2024-04 | - |
Pricing and availability
| Pricing attribute | Claude 3.5 Sonnet v2 | DeepSeek V3.1 |
|---|---|---|
| Input price | $6/1M tokens | $0.27/1M tokens |
| Output price | $30/1M tokens | $1/1M tokens |
| Providers |
Capabilities
| Capability | Claude 3.5 Sonnet v2 | DeepSeek V3.1 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | No | No |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | Yes | Yes |
| Code execution | No | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
Deep dive
The capability footprint differs most on code execution: DeepSeek V3.1. Both models share vision, multimodal input, and structured outputs, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Claude 3.5 Sonnet v2 lists $6/1M input and $30/1M output tokens on the cheapest tracked provider, while DeepSeek V3.1 lists $0.27/1M input and $1/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts DeepSeek V3.1 lower by about $12.71 per million blended tokens. Availability is 2 providers versus 8, so concentration risk also matters.
Choose Claude 3.5 Sonnet v2 when long-context analysis and larger context windows are central to the workload. Choose DeepSeek V3.1 when coding workflow support, lower input-token cost, and broader provider choice are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency.
FAQ
Which has a larger context window, Claude 3.5 Sonnet v2 or DeepSeek V3.1?
Claude 3.5 Sonnet v2 supports 200k tokens, while DeepSeek V3.1 supports 64k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Claude 3.5 Sonnet v2 or DeepSeek V3.1?
DeepSeek V3.1 is cheaper on tracked token pricing. Claude 3.5 Sonnet v2 costs $6/1M input and $30/1M output tokens. DeepSeek V3.1 costs $0.27/1M input and $1/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude 3.5 Sonnet v2 or DeepSeek V3.1 open source?
Claude 3.5 Sonnet v2 is listed under Proprietary. DeepSeek V3.1 is listed under MIT. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude 3.5 Sonnet v2 or DeepSeek V3.1?
Both Claude 3.5 Sonnet v2 and DeepSeek V3.1 expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, Claude 3.5 Sonnet v2 or DeepSeek V3.1?
Both Claude 3.5 Sonnet v2 and DeepSeek V3.1 expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run Claude 3.5 Sonnet v2 and DeepSeek V3.1?
Claude 3.5 Sonnet v2 is available on AWS Bedrock and Anthropic. DeepSeek V3.1 is available on Microsoft Foundry, Fireworks AI, NVIDIA NIM, Together AI, and AWS Bedrock. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-06-15. Data sourced from public model cards and provider documentation.